What criteria must an operator use in determining whether emergency flow restricting devices are required to protect HCAs?
Operators must make these determinations using criteria that they define, considering the circumstances of each HCA and the pipeline segments that may affect it. The rule includes specified factors that must be considered in these evaluations. They include: the swiftness of leak detection and pipeline shutdown capabilities, the type of commodity carried, the rate of potential leakage, the volume that can be released, topography or pipeline profile, the potential for ignition, proximity to power sources, location of nearest response personnel, specific terrain between the pipeline and the high consequence area, and benefits expected by reducing the spill size. An operator is required to install an emergency flow restricting device if the operator determines one is needed to protect an HCA. PHMSA Pipeline Safety will be reviewing operator analyses for technical justification and thoroughness. Because of the significant variation in pipeline design and operation, the physical characterist
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